<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>盒阴影</title>
  <style>
    div{
      width: 800px;
      height: 300px;
      background: red;
      margin: 10px auto;
      box-shadow: 50px 30px 10px 10px yellow inset;
    }
  </style>
</head>
<body>
<div>

</div>
</body>
</html>
